空肠弯曲菌penner o:19 cjaA基因的克隆表达

目的克隆空肠弯曲菌penner o:19 cjaA基因,构建其原核表达载体,诱导表达及纯化蛋白,为基因工程疫苗的研制打下基础。方法扩增空肠弯曲菌penner o:19 cjaA基因,构建pGEM-T-cjaA克隆载体,以EcoRI和XhoI为酶切位点构建pGEX-4T-1-cjaA原核表达载体。表达载体转化E.coli BL21后诱导表达,SDS-PAGE鉴定表达产物,用Glutathione Sepharose4B纯化重组蛋白。结果成功构建pGEX-4T-1-cjaA表达载体,并获得浓度为10μg/μl的rGST-CjaA重组蛋白。结论成功构建pGEM-T-cjaA克隆载体及pGEX-4T-1-cjaA表达载体,获得重组蛋白rGST-CjaA,为研究空肠弯曲菌疫苗打下基础。

Construction of the prokaryotic express vector of cjaA gene of campylobacter jejuni

Objective To construct prokaryotic expression vector carrying campylobacter.jejuni penner o:19 cjaA gene,express it in E.coli and purify protein.Methods The cjaA gene were amplified by PCR.The clone vector pGEM-T and expression vector pGEX-4T-1 with inserted cjaA gene were constructed.The target protein was expressed in E.coli BL21.The protein was identified and analyzed by SDS-PAGE.The target protein was purified by Glutathione Sepharose4B.Results Constructed the expression vector pGEX-4T-1-cjaA,purified the recombinant protein.Conclusion The recombinant plamid pGEM-T-cjaA and pGEX-4T-1-cjaA have been successfully constructed and the GST-CjaA protein is purified,which lays the foundation for the further development of C.jejuni genetic engineering vaccine.